202 Dr Balfour's Des^cription of Hare Plants. 



flowered. — In the Glasgow Garden there is a plant about the same 

 size. In October 1846, the plant flowered in the Edinburgh 

 Botanic Garden. Sir William Hooker has figured a specimen 

 from the greenhouse of the United Gardeners' Society, King's 

 Road, Chelsea; and he remarks, that it is probable that the great 

 heat and much sun of the season lias contributed to the flowering. 

 The plant has flowered also in the Birmingham Botanic Garden, 

 under the care of Mr Cameron. The flowers are very showy. 



ExOGONlUM PuRGA, Bentli. — The True Jalap plant. — Con- 

 volvulacete. — Pentandria Monogynia. 



Generic Charactek. — Sepala quinque. Corolla tubulosa, stamina 

 exserta. Stylus 1. Stigma capitatum, bllobum, Ovarum bilo- 

 culare, loculus bi-ovulatus. — Herbse aut suft'rutices, volubiles, 

 America ortae. Chohy, Mem. Soc. H. N. Genev. vi., 404. 



Specific Character. — Foliis cordatis, acuminatis integerrimis, 

 utrinque glabris, pedunculis 2-3 floris, tubo corollae calycem ob- 

 tusum quadruple superante, limbo hypocraterimorpho, lobis ob- 

 tusis, sub-emarginatis. 



Iporacca Purga, Wtncleroth, Pharmac. Centralb. I. p. 457. Choi.<>/, 

 Dec. Prod, ix,, 346. Lindkij, Flora Medica, No. 809. Bot. llcg. 

 Misc. 1839, No. 136, and Sept. 1847. Nces ah E-ienbeck, PI. Oii". 

 Suppl. 3. t. 13. Hayne, Darstell. uud, Beschreib. der in All. 

 Arzneikunde Gebrauchl. Pflanzen. 1833, t. 33, 34. 



Ipomoea Schiediana, Zuccarini Flora, 1831, p. 801. Abhandl. 

 Bajer. Acad. Wissenschaft, 1832. 



Ipomoea Jalapa, Nuttall and Coxe, American Journal of Med. 

 Sciences. February 1830, t. 7. Royla, 111. Himal., p. 308. 

 (non Pursh.) 



Exogonium Purga, BenfJi. PI. Hartweg, 46. Bot. Mag. Feb. 1847. 



Convolvulus Jalapa, Schiede in Linnsea, 1830, p. 473. 



Tuber roundish, becoming as large as a moderate-sized turnip, bronn 

 externally, whitish internally, giving rise to numerous rootlets and 

 stems. Stem twining from right to left, spirally twisted, gla- 

 brous, marked with numerous ridges and furrows (20 or more), 

 branching, more or less purplish-red, extending 10 or 12 feet. 

 Leaves alternate, ex-stipulate, petiolate, cordate or sagittate-cor- 

 date, deeply lobed at the base, acuminate, entire, glabrous on 

 both sides, slightly rugose, dull green above, paler or subglaucous 

 below, reticulated, veins radiating at the base, prominent on the 

 lower surface of the leaf, and channelled on tlie upper. Petioles 

 about 2 inches long, shorter than the leaves, striated, grooved 

 above, rounded below. Peduncles reddish, axillary, erect, twisted. 



